Title of Talk: PHOTONIC CRYSTALS OSCILLATORS Speaker

Manipal University Jaipur

Department of Physics

Webinar On Blend of Physics & Materials

Report 1

Title of Talk: PHOTONIC CRYSTALS OSCILLATORS

Speaker

Eduardo Lugo PhD

Associate Researcher

Faubert Lab, School of Optometry, Quebec, Canada

Convener of the Event: Dr. Sushil Kumar Jain Date of the Event: 23/06/2021

Flyer of the event

About the Speaker

J. Eduardo Lugo received his PhD degree in physics from Morelos State University,

Cuernavaca, Mor., Mexico. His research involved experimental and theoretical studies of

porous silicon nanostructures. He was a professor in the Department of Physics at Morelos

State University, where his research focused on porous silicon multilayers and molecular

dynamics simulations; and he was professor at the Center for Energy Research of the National

Autonomous University of Mexico (UNAM), where his work entailed research on the electro-

optical properties of nanostructures and multilayer filters. He was a postdoctoral fellow in the

Electrical and Computer Engineering Department and the Center for Future Health at the

University of Rochester, Rochester, NY, working with biosensors and photonic bandgap

materials based on nanostructures of silicon; and at the Photonic Systems Group in the

Electrical and Computer Engineering Department at McGill University, Montreal, QC, Canada,

working with OE-VLSI systems. Currently, he is associated at the Faubert Lab, School of

Optometry, Quebec, Canada, where he is looking for new photonic applications.

Abstract of the talk

Photonic crystals have been an object of interest because of their properties to inhibit specific wavelengths and allow the transmission of others. Using these properties, we have designed a microcavity of Porous Silicon using two one-dimensional photonic crystals with an air defect between them. When we illuminate the microcavity with the appropriate light wavelength an electromagnetic force within the structure is generated. These electromagnetic forces allow the microcavity to oscillate mechanically and we have named such a device Photodyne. Experimentally, we have characterized the maximum displacement of several photodynes by using different driven frequencies and light powers. The displacements were put in evidence using a commercial vibrometer and by interferometry. From these measurements, it is

possible to estimate the generated forces. Finally, we induced mechanical self-oscillations. The electromagnetic force generated within the whole photonic structure, by light is enough to overcome energy losses and sustain self- oscillations at two different frequencies. From these mechano-optical measurements, we estimated the stiffness and Young's modulus of porous silicon and compared the results with values reported elsewhere and with values estimated herein by a mechanical method.

A possible application of these oscillators also discussed.

Photographs of the event

Attendance list

Full Name User Action Timestamp

Dr. Sushil Kumar Jain [MU - Jaipur] Joined 6/23/2021, 9:39:47 AM

Sandhya Kattayat Joined before 6/23/2021, 9:39:47 AM

Sandhya Kattayat Left 6/23/2021, 11:23:44 AM

Dr. Anoop Kumar Mukhopadhyay [MU - Jaipur] Joined

6/23/2021, 9:41:57 AM

Dr. Anoop Kumar Mukhopadhyay [MU - Jaipur] Left

6/23/2021, 10:31:12 AM

Dr. Ashima Bagaria [MU - Jaipur] Joined 6/23/2021, 9:43:50 AM

eduardo.lugo (Guest) Joined 6/23/2021, 9:45:57 AM

eduardo.lugo (Guest) Left 6/23/2021, 9:46:00 AM





Samriddh Kumar Singh [ECE - 2020] Joined 6/23/2021, 9:47:17 AM

Samriddh Kumar Singh [ECE - 2020] Left 6/23/2021, 9:47:21 AM

palaktarachandani (Guest) Joined 6/23/2021, 9:48:39 AM

palaktarachandani (Guest) Left 6/23/2021, 10:34:37 AM

palaktarachandani (Guest) Joined 6/23/2021, 10:34:58 AM

Eduardo Lugo (Invité) (Guest) Joined 6/23/2021, 9:53:16 AM

Eduardo Lugo (Invité) (Guest) Left 6/23/2021, 11:21:09 AM

Dr. Uvais Valiyaneerilakkal [MU - Jaipur] Joined

6/23/2021, 9:53:36 AM

mpatel1439 (Guest) Joined 6/23/2021, 9:53:45 AM

Dr. Vipin Kumar [MUJ] Joined 6/23/2021, 9:54:16 AM

Dr. Anupam Sharma [MU - Jaipur] Joined 6/23/2021, 9:54:32 AM

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Dr. Satyapal Singh Rathore [MU - Jaipur] Joined

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Sagar Yadav [ECE - 2020] Joined 6/23/2021, 10:01:22 AM

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Dr. Saikat Chattopadhyay [MU - Jaipur] Joined 6/23/2021, 10:01:24 AM

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SMRITI SHILPAM - 192902004 Joined 6/23/2021, 10:16:53 AM

SMRITI SHILPAM - 192902004 Left 6/23/2021, 10:27:43 AM

Chandan Singh Joined 6/23/2021, 10:18:23 AM

Chandan Singh Left 6/23/2021, 11:35:31 AM

Dr. Nilanjan Halder [MU - Jaipur] Joined 6/23/2021, 10:20:15 AM



Dr. Pushpendra Kumar [MU - Jaipur] Joined 6/23/2021, 10:21:09 AM

Dr. Pushpendra Kumar [MU - Jaipur] Left 6/23/2021, 10:41:03 AM





Ashima Sharma [PhD - 2020] Joined 6/23/2021, 10:29:03 AM

Ashima Sharma [PhD - 2020] Left 6/23/2021, 11:20:06 AM

Ashima Sharma [PhD - 2020] Joined 6/23/2021, 11:21:56 AM

Ashutosh Anand (Guest) Joined 6/23/2021, 10:34:06 AM

Abinash Tripathy (Guest) Joined 6/23/2021, 11:19:30 AM

Title of Talk: PHOTONIC CRYSTALS OSCILLATORS Speaker

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